Arrhenius equation Quiz
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5 questions, one answer each
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1. What happens to the value of e^(−Ea/RT) when the temperature increases?
- A. It decreases
- B. It increases
- C. It stays the same
- D. It becomes negative
2. A graph of ln k against 1/T has a gradient of −6.0 × 10³ K. What is Ea? (R = 8.31 J K⁻¹ mol⁻¹)
- A. 49.9 kJ mol⁻¹
- B. 722 J mol⁻¹
- C. −49.9 kJ mol⁻¹
- D. 6.0 kJ mol⁻¹
3. Which quantity is found from the intercept of a graph of ln k against 1/T?
- A. Ea
- B. Ea/R
- C. R
- D. ln A
4. Why must Ea in kJ mol⁻¹ be converted before being used with R = 8.31 J K⁻¹ mol⁻¹?
- A. kJ is not an SI unit
- B. T would otherwise be in °C
- C. R is in J K⁻¹ mol⁻¹, so Ea must be in J mol⁻¹ for Ea/RT to have no units
- D. A would be wrong
5. Two reactions have the same A. Reaction P has a larger Ea than reaction Q. At the same temperature, which statement is correct?
- A. P has the larger k
- B. Q has the larger k
- C. They have the same k
- D. P has a smaller gradient on a ln k against 1/T plot